Boiler furnace



May l5, 1928.

v N BDARD BOILER FURNACE Flled Julv 18 1927 @vi/Immo May 15,v 192s.

N. BEDARD BOILER FURNAGE Filed July 18. 1927 2 sheets-sham 2 E1|:.

wil/nwo fea Umzuege Patented May 15, 1928.

UNITED* STATES NAPoLoN BnARnor QUEBEC, QUEBEC, CANADA BOILF-R, FURNACE.

Application ined nay 1s,

The invention ainis to provide a new and improved boiler furnace of such construction as to effectively consunie smoke, thus not only preventing the undesirable dis- (.'fharge of black, soot-laden smoke, but increasing the efficiency of the furnace.

lilith the foregoing in view, the invention re ',ps in the novel sul ject matter herein- :if `cr described and claimed, the description beingsupplenicnted by the accompanying drawing.

Fig. l is a longitudinal sectional View showing the invention in connection with a lire tube boiler.

Fig. 2 is a vertical transverse section on une 2 2 or rig. i.

Fig. 3 is a longitudinal section showing the application of the invention to a water tube boiler.

Fig. l is a transverse section on line -l4 of Fig. El.

*i on the accompanying drawing, denotes boiler of common construction, in connection with which` the usual bric -work or other masonry M is used. Gr denotes the usual grate, A has reference to the ash pit below said grate, and F denotes the fire-box. it the rear end of this fire-box, `is a bridge wall 5 of the novel construction hereinafter described, and suitable means G--T are provided over and behind said bridge wall, forcing the products of combustion to pass first rearwardly above said wall and then downwardly behind the same before they can escape. While the outgoing gases are traveling in this manner, auxiliary air is supplied to them by the means l'iereinafter lescribed, and this air so mixes with un burned fuel units as to cause thorough combustion thereof, thus preventing the discharge of dense smoke and also increasing the efliciency of the furnace and its boiler.

The upper edge of the bridge wall 5 isk tranversely stepped to provide a rear, relatively high step 8 and a front, comparatively low step 9. A draught inlet slot 10 eX- tends longitudinally of the wall 5 and has its delivery end disposed at the rear portion of the step 9, immediately in front of the step 8. The inlet end 11 of this draught slot may be located at any desired point, determined primarily by the boiler construction, but such end preferably communicates with the ash pit A. For controlling the entrance of air into this slot, I have shown a pivoted damper 12 and an operating rod 13 therefor.

1927. Serial No. 206,652.

This rodi may either be controlled by hand or by some automatic means, as may be desired. l i

I am aware that prior to my invention,

draught inlet passages have been providedin bridge walls, but attent-ion is invited to the fact that the portion of the step 9y between the front of said bridge wall and the discharge end of the slot 10, is rearwardly inclined.v I have found this construction to be greatly advantageous over other constructions, andl whereas without this inclination, I could not burn as much as of the volume of the smoke, the particular construction shown at the upper end of the bridge wall, enabled me to consume substantially thus not only preventing the objectionable discliarge of smoke into the atmosphere, but tremendously `increasing the efliciency of' the furnace and associated boilein Hence, it is in this improved construction at the upper edge ofthe bridge wall, that the gist of the present invention resides. In other regards, the furnace construction may be conventional and varied in numerous ways. It will also be understood that the proportions of parts may be changed according to the sizes and types of furnaces with which the invention is used, and that the upper edge of the bridge wall may either be st `aight or curved, as will be clear from a comparison of Figs. 2 and fl.

I claim;

l. In a boiler furnace, ak grate, a bridge wall at the rear end thereof, the upper edge of said bridge wall being transversely stepped to provide a rear relatively high step and a front comparatively low step, said front step having an upwardly and rearwardly inclined surface, said bridge wall having` a vertical, longitudinal. draught Vinlet slot which opens upwardly tl'iro'ugh the rear portion of said con'iparatively low step, and has its lower end turned forwardly and opening into theash pit of the furnace, a damper to control the admission of air into said lower end of the slot, a Vertical wall behind and spaced from said bridge wall and having a vpassage in its lower portion, and a horizontal upper wall projecting from the upper end of lsaid vertical wall and over said bridge wall and the space'between said walls.

2. In a boiler furnace, a grate, a bridge wall at the rear thereof, the upper edge of said bridge wall being transversely stepped to proi/i'defarear relatiyelylh'igh step and `a front comparatively low step, said front step having' an upwardly and rearwardly inclined surface, theV rear uSidelofsaid bridge Wall being extended rearwardly at its loyver end, said extension having' its vupper surface curved rearwardly and downwardly to direct the currents of -inke andair rear` Wardlyg after passing over the bridge Wall,

)said IbridgeXyall'jalso"having a Vertical longiftud'iiial dra'ii'glit inlet slot which opens upwardly `"through the rear portion of 'Said comparatively low"step 'andlias its vlower lend turnedjforwardly and opening into the ash pit of the furi'iaceja damper to control theadxnissionfof airl into said lower end of the Slot, ayer-tical rvallf behirfd and spaced i tance therefrom and forwardly over the lnl'idge wall, the Space between Said Walls and over the entire fire box or tlleifurnace. Y i

In vtestimony whereof I llave hereiinto aii'ixed my signature. 

